Causes of Excessive Smoke During Elastomer Pelletizing And Preventive Measures in Formulation And Process

 

Excessive smoke in the workshop during elastomer pelletizing can harm health, reduce pellet quality, and even cause fires.

I. Causes of Excessive Smoke during Elastomer Pelletizing

Excluding equipment-related factors, the main causes may include:

1. Raw Material Quality Issues:

If the raw materials contain high levels of impurities, these       impurities may decompose or burn at high temperatures, generating smoke.

If moisture in the raw materials is not adequately removed,       the moisture will evaporate at high temperatures, forming water vapor and       causing smoke.

2. Improper Temperature Control of the Extruder:

If the extruder temperature is too high, the melt may undergo       thermal decomposition, resulting in smoke and harmful gases.

3. Excessive Extrusion Speed:

If the extrusion speed is too fast, volatile components in the       material may not be expelled in time, leading to decomposition at high       temperatures and the formation of smoke.

4. Formulation Issues:

Low-viscosity or low-flashpoint oils in the formulation may       vaporize or decompose at high temperatures, producing smoke.

II. Preventive Measures

To reduce or prevent smoke during the elastomer pelletizing process, the following measures can be implemented:

1. Optimize Formulation:

Select high-temperature-resistant materials for pigments and       fillers in the formulation.

2. Optimize Pelletizing Process:

Set appropriate processing temperatures and enhance       temperature monitoring and control to prevent material degradation.

Control the extrusion speed to ensure sufficient melting and       venting of the material.

3. Maintain Pelletizing Equipment:

Regularly clean and maintain the equipment.

4. Choose High-Quality Base Materials and Oils:

Select high-purity grades of SEBS and SBS, pre-dry the       materials, and avoid using recycled materials.

Use oils with high flash points and narrow molecular       distribution, and allow the mixture to sit for 6 hours before blending to       prevent small molecule volatilization.

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